A step-down transformer has a power output of 50 W and efficiency of 80%. if…

A step-down transformer has a power output of 50 W and efficiency of 80%. if the mains supply voltage is 200 v, calculate the primary current of the transformer.
  • A.
    0.31 A
  • B.
    3.20 A
  • C.
    3.40 A
  • D.
    5.00 A
Correct Answer: Option A
Explanation

Efficiency = (power output)/power input x 100%
= 1s VS x 100% 1p
Vp
∴ (80)/100 = (50)/IP x 200
I P = (50 x 100)/80 x 200 = 3.125 A

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